BIOL 111 Study Guide - Final Guide: Zygote, Planula, Sternum

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BIOL 111 Full Course Notes

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Contain stinging cells called cnidocytes that assist in the capture of prey and defense. General body plan consists of two layers of cells surrounding a central cavity (radially symmetry) Two general forms: polyp: fairly sessile, in which the oral surface (mouth) is upward and the aboral surface is attached to the substrate, medusa: free swimming form in which the mouth is usually downward. **if organism has both forms in their life cycle, they are called dimorphic. Generally, they have life cycles that alternate between a motile sexual medusa stage and a sessile asexual polyp stage. Hydra attaches its foot (basal disc) to the bottom of the dish and extends its tentacles and body column. Move by gliding on its foot, inching along with its tentacles and foot, by somersaulting from foot, to tentacles, to foot or by floating on a bubble of gas secreted by the foot.

Related Questions

1) Which is not true about Hydra's life cycle?

a-It reproduces asexually by meansofbudding

b- it alternates between the polyp formandthe medusa form

c- the polyp produces the eggandsperm

d- only the polyp form is everhaploid

2) A parasitic worm living in a vertebrate instestineprobablyhas little need for

a- high degree of tolerance

b- digestive tract

c- reproductive organs

d-means of attachement to the host

e-glycolysis

1. A stalked, sessile marine organism has several elongated feeding structures surrounding an opening where good is ingested. This organism could potentially be a cnidarian, a tube-dwelling worm, a crustacean or an echinoderm. Finding which of the possibilities below in this organism would allow you to be certain of the organismâs identity?

a. Radial symmetry

b. A hard shell composed of calcium carbonate

c. The presence of a sac body plan

d. A nervous system

2. An elementary school science teacher decided to liven up the classroom with a salter aquarium. Knowing that saltwater aquaria can be a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. nExt, the teacher decided to stock the tank with various marine invertebrates, including a polychaete(annelid), a siliceous sponge, several bivalves, a shrimp, several sea anemones of different types, a colonial hydra, a few coral species, a sea star, and several herbivores gastropod varieties. Lastly, she added some vertebratesâa parrotfish and a clownfish. She arranged for daily feedings of copepods and feeder fish. ï¼Questions 2-4)

Parrotfish have mouths adapted to scrape algae off a coral and can even munch on croal as well. If the aquariumâs corals rapidly died in their place would be shards ofâ¦

a. Chitin

b. Calcium carbonate

c. Silica

d. Cartilage

3 The teacher wanted to demonstrate that some of the invertebrates possess a closed circulatory system. The teacher would remove and dissect aâ¦

a. Polychaete

b. Bivalve

c. Sea star

d. Shrimp

4. The bivalves in the aquarium started to die one by one; only the undamaged shells remained. If the teacher used a microscope to examine the external surfaces of the empty shells of the bivalves, the teacher would probably see (marks?) left byâ¦

a. Jaws

b. Nematocysts

c. Tube feet

d. Radulae

turquoisedeer344

QUESTION 94

Which characteristic is shared by Phylum Cnidaria and Phylum Platyhelminthes?

		dorsoventrally flattened bodies
		radial symmetry
		a distinct head
		a digestive cavity with a single opening (sac-like)

1 points

QUESTION 95

Which of the following is not a characteristic of members of Phylum Porifera?

		choanocytes
		asymmetry
		nervous system
		spicules

1 points

QUESTION 96

Most animals are bilaterially symmetrical deuterostomes.

True

False

1 points

QUESTION 97

Parasitism is one of the most widespread life strategies to evolve. Which of the following supports this finding?

		Parasites almost always predigest their hosts' tissues and, therefore, spend less energy and require fewer structural adaptations.
		Parasites, unlike predators, feed on almost all the tissues of their hosts.
		Parasites do not generally kill their hosts; thus they can feed on the same host throughout the host's normal life span and do not have competition from decomposers.
		Parasites generally kill their host and can feed for a very long time because they are much smaller than their host.

1 points

QUESTION 98

The production of sterile mules by interbreeding between female horses (mares) and male donkeys (jacks) is an example of _____.

		reduced hybrid viability
		hybrid breakdown
		reduced hybrid fertility
		mechanical isolation

1 points

QUESTION 99

A snail-like, coiled, porous test of calcium carbonate is characteristic of

		diatomes
		ciliates
		water molds
		foraminiferans

1 points

QUESTION 100

Which group of algae can create "red tide"?

		Phaeophyta
		Dinoflagllata
		Rhodophyta
		Chlorophyta

BIOL 111 Study Guide - Final Guide: Zygote, Planula, Sternum

BIOL 111 Full Course Notes

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